add Leonardo to tools.rst
Merge pull request #593 from PrFalken/patch-1

add Leonardo to tools.rst
added graphite-module to pythonpath

Running build-index failed importing python module. It is not in python path by default, so I would propose to add default path before execution.
Merge pull request #599 from ImmobilienScout24/rebase_442

added graphite-module to pythonpath
add missing colon
Merge pull request #600 from ImmobilienScout24/rebase_442

add missing colon